DE2402877C2 - Sound absorbing plate - Google Patents
Sound absorbing plateInfo
- Publication number
- DE2402877C2 DE2402877C2 DE2402877A DE2402877A DE2402877C2 DE 2402877 C2 DE2402877 C2 DE 2402877C2 DE 2402877 A DE2402877 A DE 2402877A DE 2402877 A DE2402877 A DE 2402877A DE 2402877 C2 DE2402877 C2 DE 2402877C2
- Authority
- DE
- Germany
- Prior art keywords
- sound
- resonator
- cell
- absorbing plate
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010521 absorption reaction Methods 0.000 claims description 26
- 238000005192 partition Methods 0.000 claims description 7
- 239000002250 absorbent Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 206010052428 Wound Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/041—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/045—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2607/00—Walls, panels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Chemical & Material Sciences (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Building Environments (AREA)
Description
Die Erfindung betrifft eine schallabsorbierende Platte mit einer Anordnung wandungsbildender Mittel, die eine Anzahl nebeneinanderlicgender akustischer Hohlraum-Resonatoren bilden, deren benachbarte offene Enden die SchalleintrittsöHnungcn der Anordnung darstellen, wobei der Abstand zwischen den benachbarten Hohlraum-Resonatoren maximal eine Wellenlänge der höchsten Freauenz des von der Platte zu absorbierenden Schalls beträgt, und die unterschiedliche Resonanzfrequenzen aufweisen, mit einer slrömungsrcsistcntcn, durchlässigen und die schallaufnehmenden Enden der Hohlraum-Resonatoren überdeckenden Vorderwand, und mit einer s gemeinsamen undurchlässigen Rückwand, die die zu den Schalleintrittsöffnungen entgegengesetzten Enden der Hohlraum-Resonatoren abdeckt.The invention relates to a sound-absorbing plate with an arrangement of wall-forming means that has a Number of adjacent acoustic cavity resonators form, the adjacent open ends of which represent the SchalleintrittsöHnungcn of the arrangement, wherein the distance between the neighboring cavity resonators is a maximum of one wavelength of the highest Freauence of the sound to be absorbed by the plate, and the different resonance frequencies have, with a flow resistance, permeable and the sound-absorbing ends of the cavity resonators covering the front wall, and with a s common impermeable rear wall covering the ends of the opposite to the sound inlets Cavity resonators covers.
Bei einer derartigen bekannten schallabsorbierenden Platte mit einer Anordnung wandungsbildender MittelIn such a known sound-absorbing plate with an arrangement of wall-forming means
in (DE-GM 1823527), die einen schalldämpfenden Mehrfachresonator darstellt, bilden die nebeneinanderliegenden akustischen Hohlraum-Resonatoren Helmholtz-Resonatoren, die jeweils nur ein einziges Ansprechmaximum aufweisen. Jeder Helmholtz-Resonator wirkt alsin (DE-GM 1823527), which has a sound-absorbing multiple resonator represents, the adjacent acoustic cavity resonators form Helmholtz resonators, each of which has only a single response maximum. Every Helmholtz resonator acts as a
υ Massc-Federsyslem mit einem einzigen Freiheitsgrad. Der Grund dafür, daß beim Helmholtz-Resonator nur ein signifikanter Spitzenwert der Resonanz vorliegt, basiert auf der in der ScballeintrittsölTnung befindlichen Luftmenge, die die Masse des Masse-Federsystems ver-υ Massc spring system with a single degree of freedom. The reason why there is only a significant peak value of the resonance in the Helmholtz resonator is based on the amount of air in the ball inlet oil, which reduces the mass of the mass-spring system
:ii körpert. Bei höheren Frequenzen bremst die Trägheit der Luftmenge die Bewegung der Luft und unterbindet eine stärkere Bewegung der Luftmenge. Es sind zwar Resonanzen höherer Ordnung möglich, die jedoch praktisch unbedeutend sind.: ii bodies. At higher frequencies, the inertia of the amount of air slows down the movement of the air and prevents it stronger movement of the air volume. Higher order resonances are possible, but they are practical are insignificant.
Der Erfindung liegt die Aufgabe zugrunde, eine sehallabsorbicrendc Platte gemäß der eingangs erwähnten Art so zu gestalten, daß auf einfache, preiswerte Weise eine effektivere Schallabsorption im Wege einer Breitbandabsorplion erreicht wird.The invention is based on the object of providing a sehallabsorbicrendc To make plate according to the type mentioned so that a simple, inexpensive way more effective sound absorption by means of broadband absorption is achieved.
3d Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die wandungsbildcndcn Mittel aus einer Anzahl rechtwinklig angeordneter und paralleler Wände bestehen, die eine Anzahl rechteckiger Zellen mit demselben Querschnitt bilden, und daß in jeder Zelle mindestens eine zusätzliche Trennwand vorgesehen ist. die die Zelle in Resonatorablcile mit unterschiedlicher Resonanzfrequenz aufteilt.3d This object is achieved according to the invention by that the wall-forming means consist of a number of walls arranged at right angles and parallel, which form a number of rectangular cells with the same cross-section, and that in each cell at least an additional partition is provided. which the cell in Resonatorablcile with different resonance frequency divides.
Vorteilhafte Weiterbildungen der erfindungsgemäßen schallabsorbierenden Platte ergeben sich aus den Untcr-Advantageous developments of the sound-absorbing plate according to the invention result from the sub-
■4» ansprüchen.■ 4 »claims.
Insbesondere tritt das Absorptionsmaximum eines Resonatorabteils im 'vescntlichen ungefähr bei der Frequenz auf, bei der das Absorptionsminimum des anderen Resonatorabteils der Zelle liegt.In particular, the absorption maximum of a resonator compartment occurs approximately at the frequency at which the absorption minimum of the other resonator compartment of the cell lies.
4i Von Wichtigkeil ist, daß jede Zelle in Resonatorablcile mit unterschiedlicher Resonanzfrequenz durch das Vorsehen mindestens einer Trennwand in jeder Zelle aulgeteilt wird. Die Resonatorableilc weisen Mehrlachresonanzen auf, die so abgestimmt sind, daß ihre Resonanz-4i It is important that every cell is in Resonatorablcile with a different resonance frequency by providing at least one partition in each cell will. The Resonatorableilc have multiple resonances that are tuned in such a way that their resonance
5Ii maxima und -minima unter Bildung eines kontinuierlichen Absorptionsspektrums zueinander angeordnet sind. Dieser Effekt wird durch das enge Beieinanderiiegcn der Resonatorabteile jeder Zelle derart, daß sic in paralleler Anordnung wirken, beträchtlich vergrößert.5Ii maxima and minima forming a continuous Absorption spectrum are arranged to one another. This effect is due to the close proximity of the Resonator compartments of each cell so that they act in a parallel arrangement, considerably enlarged.
Die erfindungsgemäße schallabsorbiercnde Platte ist in ihrem Aufbau einfach und preiswert gestaltet und ermöglicht durch ihre Breitbandabsorption gegenüber dem Stand der Technik eine effektivere Schallabsorption.The sound-absorbing plate according to the invention is Designed simply and inexpensively in their structure and made possible by their broadband absorption compared to the prior art a more effective sound absorption.
A.usluhrungsbcispielc der crfindungsgeniäßen schall-A. Example of the inventive sound
mi absorbierenden Platte werden nun anhand der Zeichnungen erläutert. In letzteren sind:mi absorbent plate will now be based on the drawings explained. In the latter are:
Fig. 1 eine schaubildliche Darstellung eines Teils einer ersten Ausführungsform der crfindungsgcmälfcn β' schallabsorbiercnden Platte,1 shows a diagrammatic representation of part of a first embodiment of the invention β 'sound-absorbing plate,
Fig. 2 eine schaubildliche Darstellung einer zweiten Ausführungsform der crfindunysgemuBcn sch.iilabsorbierenden Platte,FIG. 2 is a diagrammatic representation of a second embodiment of the oil-absorbing oil-absorbent structure Plate,
Fig. 3 eine schaubildliche Darstellung eines Teiles einer dritten Ausführungsform der erllndungsgemäßen schallabsorbierenden Platte,Fig. 3 is a diagrammatic representation of part of a third embodiment of the sound-absorbing plate according to the invention,
Fig. 4 eine schaubildliche Darstellung einer vierten , Ausführungslbrin der erllndungsgemäßen schallabsorbierenden Platte und4 shows a diagrammatic representation of a fourth embodiment of the sound-absorbing device according to the invention Plate and
Fig. 5 eine graphische Darstellung der in Prozenten ; ausgedrückten Absorptionsleistung der schallabsorbierenden Platte bezogen auf die Frequenz.Fig. 5 is a graph of the percentage; expressed absorption performance of the sound-absorbing Plate related to the frequency.
Zunächst wird die Arbeitswiese einer herkömmlichen schallabsorbierenden Platte erläutert:First, the mode of operation of a conventional sound-absorbing panel is explained:
Geht man davon aus. daß eine strömungsresistente, durchlässige Vorderwand mit einem akustischen Widerstand R und einer akustischen Impedanz Z die schallaul-Γ nehmenden F.ndcn einer Anzahl nebeneinanderliegender akustischer Hohlraum-Resonatoren überdeckt, die in einer Tiefe L von einer undurchlässigen Rückwand abgedeckt sind, so gilt für die durchlässige Vorderwand fol- ; gendes:One assumes. that a flow-resistant, permeable front wall with an acoustic resistance R and an acoustic impedance Z covers the sound-absorbing F.ndcn of a number of adjacent acoustic cavity resonators, which are covered at a depth L by an impermeable rear wall, then applies to the permeable Front wall fol-; the following:
ZR. „ , R . XZR. ", R. X
'-= -jcolKL= — +j — '- = -jcolKL = - + j -
lic lic Qc l>clic lic Qc l> c
Z I Z I
= {R+jX) und R = Z-JX = {R + jX) and R = Z-JX
'JC QC'JC QC
wobeiwhereby
InIInI
Λ = akustischer WiderstandΛ = acoustic resistance
/ = Frequenz/ = Frequency
Z = akustische ImpedanzZ = acoustic impedance
c = Schallgeschwindigkeit c = speed of sound
.V = akustische Reaktanz.V = acoustic reactance
i> = Dichte des Mediums (Gas) i> = density of the medium (gas)
sind.are.
Steigt die Frequenz an, so verläuft der Kotangens (Reaktanz) periodisch von - / zu 0 zu + /.. Jedesmal, wenn die akustische Reaktanz den Wert 0 aufweist, tritt Resonanz auf, und die Schallabsorption ist groß.If the frequency increases, the cotangent (reactance) runs periodically from - / to 0 to + / .. Each time, when the acoustic reactance is 0, resonance occurs and the sound absorption is large.
Fs gilt zudemFs also applies
AR'AR '
(J ■ C(J ■ C
wobei a der Schallubsorptionskoeffizient ist. Bei großen Reaktanzwerten wird die Absorption klein und verschwindcl bei A'= + i. . M.a. W., der mit Luft gefüllte, von der durchlässigen Vorderwand abgedeckte Hohlraum-Resonator wird bei jeder Frequenz in Resonanz versetzt, für die die Tiefe L des Hohlraum-Resonators gleich einem ungeraden Vielfachen einer viertel Wellenlänge ist. während die Absorption bei diesen Frequenzen gmU ist. Bei jeder Frequenz, für die die Tiefe des Hohlraum-Resonators eine gerade Anzahl von viertel Wellenlängen ist. Irin eine Aniiresonanz auf. und hei diesen l-'roqiienzen wird kein Schall absorbiert.where a is the sound absorption coefficient. At high reactance values the absorption becomes small and vanishes at A '= + i. . MaW, the air-filled cavity resonator covered by the permeable front wall, is set into resonance at any frequency for which the depth L of the cavity resonator is equal to an odd multiple of a quarter wavelength. while the absorption at these frequencies is gmU. At any frequency for which the cavity depth is an even number of quarter wavelengths. Irish an anti-resonance. and no sound is absorbed under these conditions.
I·' ι μ. I zeigt eine schaubildliche Darstellung eines Teils einer ersten Ausführungslbrm der schallabsorhicrcndcn Platte mit einer slrömungsrcsistenten. verhältnismäßig schalldurchlässigen Vorderwand I. die aus Metall.I · 'ι μ. I shows a perspective view of a part a first embodiment of the sound absorber Plate with a flow barrier. relatively sound-permeable front wall I. those made of metal.
Kunststoff, aus einem keramischen oder einem anderen geeigneten Material hergestellt sein kann, und mit einem zellenartigen Aufbau, der auf einer gemeinsamen undurchlässigen Rückwand 2 getragen ist. Die Rückwand 2 kann ebenfalls aus Metall, Kunststoff, Keramik oder aus einem anderen geeigneten Material hergestellt sein. Der Zellenaufbau der Ausführungsform nach Fig. 1 wird von einer Vielzahl rechtwinklig angeordneter und paralleler Wände 3 und 4 gebildet. In Fig. 1 ist die am weitern sten außen gelegene senkrechte Seitenwand weggelassen, um den inneren Aufbau zu zeigen. Die Wand 3 und 4 bilden jeweils eine rechteckige Zelle, jede rechteckige Zelle weist eine Trennwand 5 auf, die die Zelle in zwei Resonatorabteile mit unterschiedlicher Resonanzfrequenzaufteilt. Die Resonatorabteileweisen unterschiedliche Größe und/oder Form auf.Plastic, one ceramic or another Suitable material can be made, and with a cell-like structure, which is on a common impermeable Rear wall 2 is worn. The rear wall 2 can also be made of metal, plastic, or ceramic another suitable material. The cell structure of the embodiment of FIG. 1 is formed by a plurality of walls 3 and 4 which are arranged at right angles and parallel. In Fig. 1 is the furthest Most external vertical side wall omitted to show the internal structure. The wall 3 and 4 each form a rectangular cell, each rectangular The cell has a partition 5 which divides the cell into two resonator compartments with different resonance frequencies. The resonator compartments are different in size and / or shape.
Obwohl üblicherweise die Resonatorabteile aufgrund ungleicher Volumina verschiedene Resonanzfrequenzen aufweisen, können auch konvergierende oder divergierende Hornelemente mit gleichen Volumina, jedoch unterschiedlichen Resonanzfrequenzen aufgrund verschiedener Ausgestaltung verwendet werden. Auch die Schalleintrittsquerschnitte können ungleich sein.Although the resonator compartments usually have different resonance frequencies due to unequal volumes can also have converging or diverging horn elements with the same volumes, but different Resonance frequencies can be used due to different design. Also the sound inlet cross-sections can be unequal.
Wie aus Fig. 1 hervorgeht, sind die Volumina der Resonatorabteile einer Zelle mit den Wunden 2, 3, 4 unterschiedlich groß, so daß die Impedanzen und damit die Resonanzfrequenzen benachbarter Resonatorabteile ungleich groß sind. Bei der in Fig. 1 dargestellten Ausführungsform weist das kleinere Resonatorabteil eine κι konvergierende Form auf, d.h., der Querschnitt wird in Richtung zur Rückwand 2 kleiner. Umgekehrt vergrößert sich der Querschnitt des angrenzenden Resonatorabteils in Richtung zur Rückwand 2.As can be seen from FIG. 1, the volumes of the resonator compartments are of a cell with the wounds 2, 3, 4 different sizes, so that the impedances and thus the resonance frequencies of adjacent resonator compartments are unequal in size. In the embodiment shown in FIG if the smaller resonator compartment has a κι converging shape, i.e. the cross-section is in Direction to the rear wall 2 smaller. Conversely, the cross section of the adjoining resonator compartment increases towards the rear wall 2.
Weiterhin sind die Resonanzfrequenezn der beiden .15 Resonatorabteile nicht mehr einfach ganzen Zahlen proportional, sondern in etwas komplizierterer Weise spektral verteilt.Furthermore, the resonance frequencies of the two .15 resonator compartments are no longer simply proportional to whole numbers, but spectrally distributed in a somewhat more complicated way.
Bei der konvergierenden Form des Resonatorabteils steigt die erste Resonanzfrequenz an, während bei der Ή) divergierenden Form des Resonatorabteils die Frequenzen der ersten und der folgenden Resonanzen absinken. Obwohl in beiden Resonatorabteilen die Tiefe L des Luftraumes gleich ist, kann durch Ändern der Form oder der Divergenz ein Resonatorabteil auf eine höhere oder eine tiefere Frequenz abgestimmt werden.With the converging shape of the resonator compartment, the first resonance frequency increases, while with the Ή) diverging shape of the resonator compartment, the frequencies of the first and the following resonances decrease. Although the depth L of the air space is the same in both resonator compartments, a resonator compartment can be tuned to a higher or a lower frequency by changing the shape or the divergence.
Werden ein konvergierendes und ein divergierendes Resonatorabteil nebeneinander angeordnet, so können ihre akustischen Impedanzen als parallelgeschaltct angesehen werden. Die akustische Nettoimpedanz der Paral-5(i lelschaltung berechnet sich dann als Parallelschaltung der beiden Einzelimpedanzen:If a converging and a diverging resonator compartment are arranged next to one another, then their acoustic impedances can be viewed as being connected in parallel. The net acoustic impedance of the Paral-5 (i The circuit is then calculated as the parallel connection of the two individual impedances:
Benachbarte Resonatorabteile können auch durch die Summierung ihrer Scheinleitwerte in Beziehung zueinander gesetzt werden. Sind die Impedanzen bekannt, so kann die Summe ihrer Reziprokwerte in derselben WeiseAdjacent resonator compartments can also be related to one another by adding up their admittance values be set. If the impedances are known, the sum of their reciprocal values can be calculated in the same way
«ι wie für elektrische Parallelschaltungen ermittelt werden. Es ergibt sich eine weitgehend abgestimmte schallabsorbierende Platte mit Breitbandabsorption, bei der kein Absinken der Absorption wie bei herkömmlichen einfachen Platten erfolgt. Die verteilte Impedanz der paralle-«Ι how to determine for electrical parallel connections. The result is a largely coordinated sound-absorbing panel with broadband absorption, with no The absorption decreases as with conventional simple plates. The distributed impedance of the parallel
(.< len Resonatorabteile der Zellen bewirkt, daß Absorptionsspitzen des einen Resonatorabteils dem Minimum der Absorption in dem anderen Resonatorabteil entspricht. (. <len resonator compartments of the cells causes absorption peaks of the one resonator compartment corresponds to the minimum absorption in the other resonator compartment.
Fig. 2 zeigt eine andere Ausführungsform der schallabsorbierenden Platte, bei der benachbarte Resonatorabteile der Zellen den gleichen Querschnitt, jedoch unterschiedliche Tiefen aufweisen. Beispielsweise wird das Resonatorabteil 6 von der Trennwand 7 an seinem zur Schalleintrittsöffnung entgegengesetzten Ende in einem Abstand 8 zur Rückwand 9 abgedeckt. D;is Resonatorabteil 11 weist eine Tiefe 12 auf. die gleich dem Abstand der durchlässigen Vorderwand 13 von der undurchlässigen Rückwand 9 ist. Die aus den Resonalorabteilcn 6 und 11 bestehende Zelle 14 ist rechteckig und wiederholt sich in dem dargestellten Aufbau.Fig. 2 shows another embodiment of the sound absorbing Plate in which adjacent resonator compartments of the cells have the same cross-section, but different Have depths. For example, the resonator compartment 6 is from the partition 7 at its to Sound inlet opening opposite end in one Distance 8 to the rear wall 9 covered. D; is a resonator compartment 11 has a depth 12. which is equal to the distance between the permeable front wall 13 and the impermeable one Rear wall 9 is. The cell 14 consisting of the resonator compartments 6 and 11 is rectangular and repeated in the structure shown.
Die Ausführungslbrm gemäß Fig. 2 weist jedoch den Nachteil auf, daß der Hohlraum zwischen der Trennwand 7 und der Rückwand 9, der von den senkrechten Wänden 16 und 17 abgeßrenzt ist, keine Funktion ausübt und somit verschwendet ist. Bei der Ausführungsform gemäß Fig. 3 wird dieser Nachteil behoben, indem das die niedrigere Resonanzfrequenz aufweisende Resonatorabteil 29 L-förmig ausgestaltet ist, während das die höhere Resonanzfrequenz aufweisende Resonatorabteil 31 rechteckig ausgestaltet ist. Bei dieser Ausführungsform ist im wesentlichen das gesamte Volumen der Zelle absorptionsmäßig aktiv, da kein vergeudeter Raum un-. terhalb des Resonatorabteils geringeren Volumens besteht. Die übrigen Teile des Aufbaus wie die durchlässige Vorderwand 32 und die undurchlässige Rückwand 33 entsprechen der Ausführungsform gemäß Fig. 2. Die Ausführungsform gemäß Fig. 2 wirkt wegen des unausgenutzten Volumens bei einer etwas höheren Frequenz als die Ausführungsformen nach den Fig. 1 oder 3.The embodiment according to FIG. 2, however, has the disadvantage that the cavity between the partition wall 7 and the rear wall 9, which is separated from the vertical walls 16 and 17, has no function and thus wasted. In the embodiment according to FIG. 3, this disadvantage is eliminated by the the resonator compartment 29 having the lower resonance frequency is L-shaped, while the resonator compartment 31 having a higher resonance frequency is configured to be rectangular. In this embodiment is essentially the entire volume of the cell active in terms of absorption, since no wasted space is un-. there is a smaller volume below the resonator compartment. The remaining parts of the structure such as the permeable front wall 32 and the impermeable rear wall 33 correspond to the embodiment according to FIG. 2. The embodiment according to FIG. 2 acts because of the unused Volume at a slightly higher frequency than the embodiment of FIGS. 1 or 3.
Fig. 4 zeigt einen Aulbau aus einer Kombination rechteckiger und hornförmiger Resonatorabteile, dessen Herstellung verhältnismäßig wirtschaftlich ist. Zwischen einer undurchlässigen Rückwand 51 und einer durchlässigen Vorderwand 52 sind senkrechte Wände angeordnet, die eine Anordnung quadratischer Zellen aus rechtwinklig angeordneten Wänden 53 und 54 bilden. Eine einstückige Tafel 55 ist im Vakuum oder unter Anwendung entsprechender Verfahren mit einer Anzahl kegelförmiger oder parabolischer Homelemente 56 versehen, die in die von den Wänden 53 und 54 gebildeten quadratischen Zellen der Anordnung hineintragen. Jedes Hornelement 56 stellt einen abgeschnittenen Kegel dar. dessen runde Form am oberen offenen Ende zu einer quadratischen Form am unteren Ende an der undurchlässigen Rückwand 51 übergeht. Das quadratische Ende eines jeden Hornelementes 56 stößt mit gleichen Teilen benachbarter Homelemente 56 zusammen. Jedes hornartige Element 56 ist so bemessen, daß es in eine betreffende quadratische Zelle der wabenförmigen Anordnung der Zellen eindringen kann. Das Hornelement 56 divergiert vom offenen Ende aus und bildet ein Resonalorabteil 57. Das Volumen zwischen der Außenseite der konischen Mantelfläche des Hornelementes 56 und der Innenseite der Wände 53 und 54 der quadratischen Zelle konvergiert. Auf diese Weise werden zwei parallel angeordnete akustische Resonatorabteile mit unterschiedlichen Resonanzfrequenzen geschaffen.Fig. 4 shows an assembly of a combination of rectangular and horn-shaped resonator compartments, the Manufacturing is relatively economical. Between an impermeable rear wall 51 and a permeable one Front wall 52 are vertical walls that are an array of square cells made of at right angles arranged walls 53 and 54 form. An integral panel 55 is in vacuum or in use corresponding methods are provided with a number of conical or parabolic horn elements 56, which carry into the square cells formed by the walls 53 and 54 of the assembly. Every horn element 56 shows a truncated cone. Its round shape at the upper open end to a square one Form at the lower end of the impermeable rear wall 51 merges. The square end of a each horn element 56 collides with equal parts of adjacent horn elements 56. Each horny Element 56 is dimensioned so that it is in a relevant square cell of the honeycomb arrangement of the Cells can penetrate. The horn element 56 diverges from the open end and forms a resonator compartment 57. The volume between the outside of the conical jacket surface of the horn element 56 and the inside of the walls 53 and 54 of the square cell converges. In this way, two are arranged in parallel created acoustic resonator compartments with different resonance frequencies.
Die Anzahl der nebeneinanderliegenden rechteckigen Zellen ist nicht begrenzt. Auch können in jeder Zelle mehrere Trennwqpde vorgesehen werden.There is no limit to the number of rectangular cells lying next to one another. Also can in every cell several separators can be provided.
Die physikalischen Gesamtabmessungen oder die Geometrie der Zellen ist von den zu absorbierenden Frequenzen abhängig.The overall physical dimensions or geometry of the cells depends on the frequencies to be absorbed addicted.
Fig. 5 zeigt in graphischer Darstellung einen Vergleich zwischen den Absorptions-Leistungen der Ausführungsform gemäß Fi g. 2 und den Absorptions-Leistungen einer herkömmlichen, einschichtigen und wabenförmigen, schallabsorbierenden Platte, bei der der nicht unterteilte Luftraum angrenzender Zellen gleichmäßig eine Tiefe von 30cm aufweist. Im Vergleich hier/u ist die berechnete Absorplions-Leistung der Auslulmingsfnrm nach I·'ig. 2 gesetzt, bei der das kleinere Rcsonaloiabieil der Zelle jeweils eine Tiefe von 19.5 cm und das größere Resonalorabteil jeweils eine Tiefe von 30 cm aiii weisen. Die talsächlich gemessene Absorplions-LeisUmg μϋι fürFig. 5 is a graph showing a comparison between the absorption performances of the embodiment according to Fi g. 2 and the absorption performance of a conventional, single-layer and honeycomb-shaped, sound-absorbing panel in which the non-subdivided The air space of adjacent cells has a uniform depth of 30 cm. In comparison here / u is the calculated absorption power of the Auslulmingsfnrm according to I ig. 2 set, in which the smaller Rcsonaloiabieil the cell has a depth of 19.5 cm and the larger Resonalor compartment each have a depth of 30 cm aiii. The actually measured absorption power μϋι for
in einen Aufbau gemäß Ι-'ίμ. 2 mil einer Tiefe von I1'.95 cm für die kleineren Resonatorabieile und mit einer Tiefe von 30 cm für die parallelen größeren Resonalorabteile jeder Zelle. Wie aus der Kurve 59 zu ersehen ist. unifaßi die berechnete Absorption eines herkömmlichen AuI-haus mit einfachen Zellen mehrere Frequenzbänder (/. B. 55OHz, 1100 Hz und 1600Hz). bei denen nur eine geringe oder gar keine Absorption erfolgt. Die tatsächlich gemessenen Punkte 60 bestätigen diese Eigenschaft. Andererseits weist die berechnete Absorption der Ausführungs-into a structure according to Ι-'ίμ. 2 mils with a depth of I 1 '.95 cm for the smaller resonator compartments and with a depth of 30 cm for the parallel larger resonator compartments of each cell. As can be seen from curve 59. unifaßi the calculated absorption of a conventional AuI house with simple cells several frequency bands (/. B. 55OHz, 1100 Hz and 1600Hz). with little or no absorption. The actually measured points 60 confirm this property. On the other hand, the calculated absorption of the execution
:o form gemäß Fig. 2 eine verhältnismäßig gleichmüßige Absorption innerhalb des Frequenzbandes von 100Hz bis gut über 1250 Hz auf, wie aus der Kurve 61 zu ersehen ist. Diese berechnete Leistung wird durch die Messung an den Punkten 62 bestätigt.: o shape according to FIG. 2 a relatively uniform one Absorption within the frequency band from 100 Hz to well above 1250 Hz, as can be seen from curve 61 is. This calculated performance is confirmed by the measurement at points 62.
Claims (7)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00326508A US3831710A (en) | 1973-01-24 | 1973-01-24 | Sound absorbing panel |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2402877A1 DE2402877A1 (en) | 1974-07-25 |
DE2402877C2 true DE2402877C2 (en) | 1984-08-23 |
Family
ID=23272508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2402877A Expired DE2402877C2 (en) | 1973-01-24 | 1974-01-18 | Sound absorbing plate |
Country Status (9)
Country | Link |
---|---|
US (1) | US3831710A (en) |
JP (1) | JPS6038717B2 (en) |
CA (1) | CA991998A (en) |
CH (1) | CH582798A5 (en) |
DE (1) | DE2402877C2 (en) |
FR (1) | FR2214932B1 (en) |
GB (1) | GB1451649A (en) |
IT (1) | IT1008730B (en) |
SE (1) | SE389150B (en) |
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-
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- 1973-01-24 US US00326508A patent/US3831710A/en not_active Expired - Lifetime
- 1973-12-28 GB GB5991473A patent/GB1451649A/en not_active Expired
- 1973-12-31 CA CA189,254A patent/CA991998A/en not_active Expired
-
1974
- 1974-01-18 DE DE2402877A patent/DE2402877C2/en not_active Expired
- 1974-01-22 IT IT47851/74A patent/IT1008730B/en active
- 1974-01-22 SE SE7400780A patent/SE389150B/en unknown
- 1974-01-22 FR FR7402045A patent/FR2214932B1/fr not_active Expired
- 1974-01-22 CH CH85574A patent/CH582798A5/xx not_active IP Right Cessation
- 1974-01-23 JP JP49010076A patent/JPS6038717B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3530430A1 (en) * | 1985-08-26 | 1987-02-26 | Gruenzweig & Hartmann Montage | Silencer link |
DE102011120979A1 (en) * | 2011-12-13 | 2013-06-13 | Rolls-Royce Deutschland Ltd & Co Kg | Acoustic absorber |
Also Published As
Publication number | Publication date |
---|---|
GB1451649A (en) | 1976-10-06 |
CA991998A (en) | 1976-06-29 |
JPS6038717B2 (en) | 1985-09-02 |
CH582798A5 (en) | 1976-12-15 |
FR2214932A1 (en) | 1974-08-19 |
AU6416074A (en) | 1975-07-03 |
FR2214932B1 (en) | 1979-05-25 |
SE389150B (en) | 1976-10-25 |
DE2402877A1 (en) | 1974-07-25 |
JPS49110112A (en) | 1974-10-19 |
IT1008730B (en) | 1976-11-30 |
US3831710A (en) | 1974-08-27 |
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